to eat frog is eatting a womans pussy with one of her innerthighs on each ear.
woman might say to a man " Do you know how to eat frog?" and then the man would respond " Yes, i would put one leg over this ear and the other leg over this ear and then i would eat myself some frog. "
A famous catch word added as a supplementary addition to birthday wishes often said and used by Anthony Nkwazi to add emphasis on what should be done to celebrate the occasion.